POR QUE Motor DIESEL tem mais torque que motor a gasolina? - Alta RPM

ALTARPM

19 Sept 202408:10

Summary

TLDRThis video script discusses why diesel engines are preferred for heavy-duty trucks in Brazil. It explains that diesel engines produce more torque than gasoline engines, which is crucial for moving heavy loads. The script also touches on the technical aspects of diesel engines, such as longer piston strokes, high compression ratios, and direct fuel injection, all contributing to greater torque output. Additionally, it mentions that diesel engines are designed to be more robust and efficient, making them ideal for long-haul transportation and heavy-duty applications.

Takeaways

🚚 Diesel engines are preferred in heavy trucks in Brazil due to their higher torque output compared to gasoline engines.
🔧 Torque, not horsepower, is crucial for moving heavy loads, which is why diesel engines are more common in such vehicles.
📊 Diesel engines typically have a longer stroke and larger pistons, which contributes to their greater torque output.
🗜️ High compression ratios in diesel engines, along with turbocharging, lead to more efficient fuel use and increased torque.
💧 Direct diesel injection allows for better fuel-air mixture and more precise ignition timing, enhancing torque production.
🔥 Diesel fuel contains more energy per kilogram than gasoline, which contributes to the higher torque output.
🏭 Diesel engines are designed to be more robust to handle the high pressures and temperatures associated with their operation.
🔩 Diesel engines usually have lower RPMs and are optimized for maximum torque at lower speeds, making them ideal for heavy-duty applications.
🛣️ Companies often re-map diesel engines in buses to extract more torque for better performance under load and to reduce fuel consumption.
♻️ Remapping a diesel engine can lead to increased emissions if it's taken out of its optimal operating range for more power or fuel efficiency.

Q & A

Why do trucks in Brazil primarily use diesel engines?
-Trucks in Brazil primarily use diesel engines because diesel engines produce significantly more torque compared to gasoline engines, which is essential for transporting heavy loads.
What is torque, and why is it more important than power for heavy transportation?
-Torque is the force that causes rotation, and it is crucial for moving heavy loads because it helps the engine generate the necessary pulling power at lower speeds. Power, on the other hand, measures how fast work can be done, which is less critical for transporting heavy loads.
Why do diesel engines produce more torque than gasoline engines?
-Diesel engines produce more torque due to several factors: they have longer piston strokes, higher compression ratios, turbocharging (increasing air intake), direct fuel injection, and diesel fuel itself contains more energy per unit of mass than gasoline.
How does the piston stroke length affect the torque in diesel engines?
-Diesel engines typically have a longer piston stroke compared to gasoline engines, which creates a larger crankshaft lever arm. This longer stroke generates more torque by increasing the rotational force applied to the crankshaft.
What role does compression ratio play in a diesel engine’s torque production?
-Diesel engines have much higher compression ratios than gasoline engines. A higher compression ratio allows the engine to compress more air into a smaller space, which increases the efficiency of the combustion process, resulting in greater torque.
What is turbocharging, and how does it affect diesel engine performance?
-Turbocharging is the process of forcing extra air into the engine’s cylinders. In diesel engines, turbocharging increases the engine’s volumetric efficiency by allowing it to burn more fuel and air, which results in higher torque production.
Why do diesel engines generally operate at lower RPMs compared to gasoline engines?
-Diesel engines are designed to produce high torque at lower RPMs, which makes them ideal for heavy loads and commercial vehicles. The longer piston strokes and higher compression ratios of diesel engines limit their ability to reach higher RPMs compared to gasoline engines.
How does direct fuel injection improve diesel engine torque?
-In direct injection, diesel fuel is injected directly into the combustion chamber at high pressure. This allows for more precise timing and more complete combustion, which improves fuel efficiency and increases torque output.
What makes diesel fuel more energy-dense compared to gasoline?
-Diesel fuel has a higher energy density than gasoline, meaning it contains more energy per unit of mass. This greater energy content allows diesel engines to produce more torque for the same amount of fuel burned.
Why do some companies 'remap' diesel engines in buses, and what are the benefits?
-Companies remap diesel engines in buses to reduce engine torque, which helps save fuel and reduce wear on the engine and other components like the clutch and transmission. This leads to lower maintenance costs and increased longevity of the vehicle.

Outlines

00:00

🚚 Diesel Engines' Superior Torque

This paragraph discusses the preference for diesel engines in heavy trucks in Brazil due to their higher torque output compared to gasoline engines. The script introduces the concept of torque versus power and hints at an upcoming video explaining these terms. The main focus is on Julian's explanation that diesel engines produce more torque, which is essential for moving heavy loads. The video is sponsored by pneufree.com and protune, which are mentioned as resources for tires and performance parts, respectively. The script also provides an example comparing the torque output of a diesel engine (40 kg of torque) with a highly developed gasoline engine (35 kg of torque), emphasizing the inherent advantages of diesel engines in terms of torque production.

05:01

🔧 Why Diesel Engines Generate More Torque

This paragraph delves into the technical reasons why diesel engines generally produce more torque than gasoline engines. It explains that diesel engines have a longer stroke-to-bore ratio, which results in a larger crankshaft lever arm, leading to greater torque. The paragraph also mentions the high compression ratio of diesel engines, which allows for more air to be compressed into a small space, thus extracting more energy from the fuel. The direct injection of diesel and its energy content per kilogram compared to gasoline are also highlighted as factors contributing to torque production. The script touches on the practical implications of these characteristics, such as the need for robust engine components to handle the high temperatures and pressures, leading to heavier engines with fewer revolutions. It concludes by discussing the benefits of diesel engines in terms of fuel consumption and torque at low RPMs, which are ideal for heavy-duty applications like transporting loads.

Mindmap

Keywords

💡Diesel engine

A diesel engine is an internal combustion engine that uses compression ignition to ignite the air-fuel mixture. In the video, it is highlighted that diesel engines are commonly used in trucks in Brazil due to their ability to produce more torque than gasoline engines, which is essential for heavy load transportation.

💡Torque

Torque refers to the rotational force that an engine produces. It is crucial for moving heavy loads, as mentioned in the script. The video explains that diesel engines generally produce more torque than gasoline engines, making them suitable for trucks and heavy machinery.

💡Gasoline engine

A gasoline engine, also known as a petrol engine, is an internal combustion engine with a spark ignition system. The video script contrasts diesel engines with gasoline engines, noting that the latter typically have less torque, which is not as beneficial for heavy-duty applications.

💡Compression ratio

Compression ratio is the ratio of the cylinder's total volume to its volume when the piston is at the top dead center. The script explains that diesel engines have a very high compression ratio, which contributes to their ability to produce more torque.

💡Direct fuel injection

Direct fuel injection is a method of injecting fuel directly into the combustion chamber. The video mentions that diesel engines use direct injection, which allows for better fuel efficiency and higher torque production.

💡Stroke

The stroke of a piston is the distance it travels from top dead center to bottom dead center (or vice versa). The script points out that diesel engines typically have a longer stroke, which increases the leverage on the crankshaft and contributes to greater torque.

💡Bore

Bore refers to the diameter of a cylinder in an engine. The video script explains that diesel engines often have a larger stroke length compared to the bore size, which is part of the reason they generate more torque.

💡Overfueling

Overfueling is the process of increasing the amount of fuel supplied to an engine beyond what is typically used. The script mentions that diesel engines can operate with a leaner fuel mixture, which can be adjusted for performance or economy.

💡Emissions

Emissions refer to the release of pollutants from an engine. The video discusses how remapping a diesel engine to increase power can lead to higher emissions, which is a trade-off that must be considered.

💡Remap

Remapping involves adjusting the engine control unit (ECU) to change the engine's performance characteristics. The script gives an example of how companies might remap diesel engines in buses to extract more torque for better performance under load.

💡Efficiency

Efficiency in the context of engines refers to how effectively they convert fuel into mechanical energy. The video highlights that diesel engines are designed for high efficiency, which is linked to their high torque output and ability to operate with less fuel.

Highlights

Diesel engines in Brazil are preferred for trucks due to their higher torque compared to gasoline engines.

Torque is more important than power for transporting heavy loads.

A video explaining the difference between torque and power is suggested.

Diesel engines produce more torque than gasoline engines.

Diesel engines are designed to be more robust and heavier.

Diesel engines have a longer stroke and larger pistons, resulting in more torque.

Compression ratio in diesel engines is very high, contributing to more torque.

Direct diesel injection allows for efficient use of fuel and more torque.

Diesel fuel has more energy per kilogram than gasoline.

Diesel engines are designed to operate at lower RPMs for maximum torque.

Diesel engines are more fuel-efficient and have longer autonomy.

Some bus companies remap their diesel engines to extract more torque.

Remapping can reduce fuel consumption and extend the life of the engine.

Remapping can also increase emissions if the engine is taken out of its optimal performance range.

The design of diesel engines focuses on torque rather than power.

Diesel engines are generally more suitable for heavy-duty applications due to their torque production.

The video concludes by summarizing why diesel engines produce more torque than gasoline engines.